<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div class="container"> <input type="checkbox" id="chk"> <div class="signup"> <form action=""> <label for="chk">Sign up</label> <input type="text" placeholder="Username..."> <input type="email" placeholder="Email..."> <input type="password" placeholder="Password..."> <button>Sign up</button> </form> </div> <div class="login"> <form action=""> <label for="chk">Login</label> <input type="text" placeholder="Username..."> <input type="email" placeholder="Email..."> <input type="password" placeholder="Password..."> <button>login</button> </form> </div> </div>

*{ margin: 0; padding: 0; box-sizing: border-box; } body{ display: flex; justify-content: center; align-items: center; min-height: 100vh; background: #ffffff; } .container{ width: 350px; background: inherit; height: 500px; overflow: hidden; border-radius: 10px; box-shadow: -18px 5px 40px 15px rgba(0, 0, 0, 0.2); } .container #chk{ display: none; } .container .signup{ position: relative; width: 100%; height: 100%; } label{ color:rgb(26, 25, 25); font-size: 35px; display: flex; justify-content: center; margin: 50px; font-weight: 700; cursor: pointer; transition: 0.5s ease-in-out; } input{ width: 60%; height: 40px; background-color: #e0dede; display: flex; justify-content: center; margin: 20px auto; padding: 10px; border: none; outline: none; border-radius: 25px; } button{ border: none; outline: none; width: 60%; height: 40px; display: block; margin: 20px auto; border-radius: 25px; color:rgb(26, 25, 25); background-color: #e0dede; font-size: 16px; cursor: pointer; font-weight: 600; transition: 0.2 ease-in; } button:hover{ background-color: #3d54ff; } .container .login{ height: 460px; background: rgb(108, 108, 225); border-radius: 70% / 20%; transform: translateY(-180px); transition: 0.8 ease-in-out; } .container .login label{ padding-top: 10px; color:rgb(26, 25, 25); transform:scale(0.6); } .container #chk:checked ~ .login{ transform: translateY(-500px); } .container #chk:checked ~ .login label{ transform:scale(1); } .container #chk:checked ~ .signup label{ transform:scale(0.6); }